Arid
DOI10.1007/s10265-014-0685-4
Productivity responses of desert vegetation to precipitation patterns across a rainfall gradient
Li, Fang1,2; Zhao, Wenzhi1,2; Liu, Hu1,2
通讯作者Zhao, Wenzhi
来源期刊JOURNAL OF PLANT RESEARCH
ISSN0918-9440
EISSN1618-0860
出版年2015
卷号128期号:2页码:283-294
英文摘要

The influences of previous-year precipitation and episodic rainfall events on dryland plants and communities are poorly quantified in the temperate desert region of Northwest China. To evaluate the thresholds and lags in the response of aboveground net primary productivity (ANPP) to variability in rainfall pulses and seasonal precipitation along the precipitation-productivity gradient in three desert ecosystems with different precipitation regimes, we collected precipitation data from 2000 to 2012 in Shandan (SD), Linze (LZ) and Jiuquan (JQ) in northwestern China. Further, we extracted the corresponding MODIS Normalized Difference Vegetation Index (NDVI, a proxy for ANPP) datasets at 250 m spatial resolution. We then evaluated different desert ecosystems responses using statistical analysis, and a threshold-delay model (TDM). TDM is an integrative framework for analysis of plant growth, precipitation thresholds, and plant functional type strategies that capture the nonlinear nature of plant responses to rainfall pulses. Our results showed that: (1) the growing season NDVIINT (INT stands for time-integrated) was largely correlated with the warm season (spring/summer) at our mildly-arid desert ecosystem (SD). The arid ecosystem (LZ) exhibited a different response, and the growing season NDVIINT depended highly on the previous year’s fall/winter precipitation and ANPP. At the extremely arid site (JQ), the variability of growing season NDVIINT was equally correlated with the cool- and warm-season precipitation; (2) some parameters of threshold-delay differed among the three sites: while the response of NDVI to rainfall pulses began at about 5 mm for all the sites, the maximum thresholds in SD, LZ, and JQ were about 55, 35 and 30 mm respectively, increasing with an increase in mean annual precipitation. By and large, more previous year’s fall/winter precipitation, and large rainfall events, significantly enhanced the growth of desert vegetation, and desert ecosystems should be much more adaptive under likely future scenarios of increasing fall/winter precipitation and large rainfall events. These results highlight the inherent complexity in predicting how desert ecosystems will respond to future fluctuations in precipitation.


英文关键词Aboveground net primary productivity Previous precipitation Rainfall events Temperate desert regions Threshold-delay model
类型Article
语种英语
国家Peoples R China
收录类别SCI-E
WOS记录号WOS:000350826000006
WOS关键词NORTHERN CHIHUAHUAN DESERT ; NET PRIMARY PRODUCTIVITY ; GAS-EXCHANGE ; PHOTOSYNTHETIC ACTIVITY ; EXTREME PRECIPITATION ; GRASSLAND ECOSYSTEM ; SEMIARID GRASSLAND ; SOIL RESPIRATION ; EVENT SIZE ; PULSES
WOS类目Plant Sciences
WOS研究方向Plant Sciences
来源机构中国科学院西北生态环境资源研究院
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/188913
作者单位1.Chinese Acad Sci, Linze Inland River Basin Res Stn, Key Lab Inland River Basin Ecohydrol Cold & Arid, Lanzhou 730000, Peoples R China;
2.Chinese Acad Sci, Engn Res Inst, Lanzhou 730000, Peoples R China
推荐引用方式
GB/T 7714
Li, Fang,Zhao, Wenzhi,Liu, Hu. Productivity responses of desert vegetation to precipitation patterns across a rainfall gradient[J]. 中国科学院西北生态环境资源研究院,2015,128(2):283-294.
APA Li, Fang,Zhao, Wenzhi,&Liu, Hu.(2015).Productivity responses of desert vegetation to precipitation patterns across a rainfall gradient.JOURNAL OF PLANT RESEARCH,128(2),283-294.
MLA Li, Fang,et al."Productivity responses of desert vegetation to precipitation patterns across a rainfall gradient".JOURNAL OF PLANT RESEARCH 128.2(2015):283-294.
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